Checkbox remain checked after getting the result

Question

Hi ,

 

I have a WPF MVVM application. i have a dialog box window which has checkbox in grid. When i check on the checkbox some functions happening. but again when i open the dialog box i want to show the checkbox checked.

 

XAML

<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<pnx:PnxCheckBox
Command="{Binding CheckedChangedCell,Mode=TwoWay,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type DataGrid}}}"
HorizontalAlignment="Right"
IsChecked="{Binding Path=IsChecked, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
Margin="7,0,5,0"
VerticalAlignment="Center" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

This is my xaml. What i have to do in my view model.

 

Please help